To file a legal case:

1. Visit the official legal portal at legal.gov.gr
2. Register an account with your digital ID
3. Select the case type and submit the required documents
4. Track your case progress through the dashboard

Self-employed individuals must submit the following forms:

• EF4: Annual income declaration form
• Z11: Withholding tax certificate
• Tax deduction certificate (Z9) for eligible professional fees

Access forms and instructions through the official tax portal or contact the Revenue Agency.

To update personal information:

1. Log into your account at egov.gov.gr
2. Submit your identity verification documents
3. Select the "Update Profile" section
4. Submit the revised information